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# What does pi stand for?

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The number pi represents the ratio of a circle's circumference to its diameter. The ratio never changes for any circle. It is approximately valued at 3.14, but its decimal places have been figured to more than a trillion digits as of 2014.

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The circumference of a circle is the distance around its outer edge, and its diameter is the distance across it. The circumference of a circle can be calculated by multiplying pi by the diameter. Pi is considered an irrational number because it cannot be written as a fraction. Its decimal places are never-ending, and it shows no pattern of repeating within the decimals. Pi is a crucial constant in the mathematical, engineering and scientific worlds, and it's so important that March 14 (or 3-14 like the number pi) has been designated as Pi Day.

## Related Questions

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If the circumference or the area of a circle is known, pi can be used to find the diameter and the radius of that circle. Likewise, if the radius or diameter is known, pi can be used to find out the circumference or the area.

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Pi is used to find the circumference and area of a circle. It is also used to find the volume and surface area of a sphere, cone and cylinder. Pi has applications that go beyond geometry as well, such as statistics and probability.

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The approximate value of pi, which is the ratio of a circle’s circumference to its diameter, is 3.14159265, according to Collins World English Dictionary. It is impossible to represent its exact value fully and accurately since it is an irrational number with an unending, non-repeating decimal.